Exam 2 review

Exam 2 review - Chem 115a Exam 2 Thursday October 1, 2009...

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1 Chem 115a E x a m 2 Print Name Last, First Thursday October 1, 2009 Last 3 digits SID # Professor Anna Krylov TA Name/Lab Time: Questions Points Score Grader 1 25 2 14 3 11 4 14 5 12 6 12 7 12 Total 100 INSTRUCTIONS 1. You must show your work to receive credit. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST Use black or blue ink. (No pencil, no whiteout.) 4. There are 7 problems on 8 pages. Please count them before you begin. Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature
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2 1. (25 pts) (a) (6pts) Name the following species: (NH 4 ) 2 S Al 2 O 3 BaSO 4 (b) (4pts) Write the chemical formula for the following species: Sodium peroxide Potassium chlorate (c) (6pts) Assign oxidation numbers to the atoms in the following species: BaH 2 NH 4 NO 3 Cu 2 O(SO 4 ) (d) (5 pts) Recalling the electronegativity order for atoms in the 1st and 2nd row, indicate the bond polarity of the following molecules, showing the direction of the dipole using the usual picture: (i) OF (ii) OH (iii) HF (iv) HN Which one is expected to be the most polar?
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Exam 2 review - Chem 115a Exam 2 Thursday October 1, 2009...

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